Miter-box.



No.. 592,302. Patented Feb; 4,1902.

M. KELLY.

MITER BOX. (Appnmipn med sape. v11, 1901.)

(llo. Model.)

0 LDMDQP 1 I l p Nrrh STATES PATENT OFFICE.

JAMES M. KELLY, OF HOUGHTON, MICHIGAN.

Murga-Box.

SPECIFTLCATION forming part of Letters Patent No. 692,302, datedFebruary 4, 1902. Afpiicain nea september 11, 1901. serial No. 75,056.(Numan.)

To @ZZ whom t may concern:

Beit known that I, JAMES M. KELLY, a citizen of the United States,residing at Houghton, in the county of Houghton and State of Michigan,have invented a new and useful Miter-Box, of which the following is aspecification.

My invention relates to certain improvements in devices employed for thecutting of material to form ruiter-joints, and has for its principalobject to provide a device of this class with mechanism for readily andeasily effecting the adjustment of the angular positions of the base andsaw-guide, so that a cut may be made at any desired angle.

A further object of the invention is to provide for closer and moreaccurate adjustment of the parts if at any time it should becomenecessary to alter the angle of cutting to one or two degrees or anyfractional part thereof.

A still further object of the invention is to so construct the saw-guideas to render it capable of use from either side.

With these and other objects in view the invention consists in the novelconstruction and combination of parts more particularly describedhereinafter, shown in the accompanying drawings, and particularlypointed out in the appended claims.

In the accompanying drawings, Figure 1 is a perspective view of amiter-cutting device constructed and arranged in accordance with myinvention. Fig. 2 is a sectional elevation of a portion of the device onthe line 2 2, Fig. 3. Fig. 3 is a plan view of the device, partly insection. Fig. 4 is a detail perspective view of the adjusting andlocking mechanism.

Similar numerals of reference indicate corresponding parts throughoutthe various Iigures of the drawings.

1 designates the base or bed of the device, constructed, preferably, ofcast metal and having two portions extending at right angles to eachother, so that it may be placed upon the edge ot' the stock to be cut,or it may be secured Vin position to a guiding-board forming part of amiter-box. On one end of the base are lugs 2, to which are pivotedsimilar lugs 3, which project from the vertical standard 4.- of asaw-guide made in two sections and provided with a centrally-arran gedslot 5 to permit of the movement of the teeth of the saw. The upper endof the saw-guide consists of two parallel plates 6 and 7, spaced yfor adistance greater thanthe thickness of the saw-blade and serving as aguide therefor. The opposite ends of the plates Gand 7 are outwardly andoppositely flared to form enlarged mouths for the guidance of the sawbetween the plates, and these iiaring mouths are formed at both ends ofthe plates in order to permit of lthe entrance of the saw from eitherend.

Formed integral with the base 1 is a vertically-extended block or boss10, provided with a transversely-extending slot 11, in which is fittedan adjustable block 12, provided at its opposite ends with dependingears 13, having perforations threaded for the reception ofadjusting-screws 14:, the inner ends otl which bear against the sides ofthe block 10, and the arrangement being such'that the block 12 may beadjusted lengthwise in the slot by loosening one of the screws andtightening up the opposite screw, the limit of adjustment being governedby the distance between the inner sides of the ears 13 and the outerwalls ofthe block 10, and this distance being sufficient merely to electan adjustment-over a4 short angular distance, in practice not more thanthree or four degrees, and being for the purpose of obtaining a veryaccurate angular adjustment for only a fraction of a degree, any greateradjustment being e'ected by the mechanism described hereinafter.

' To the block 12 is secured a vertical plate 16, havinglaterally-extended ears 17, or the whole may be formed of an integralpiece of' metal stamped into proper form. The top of the block 10 isprovided with a threaded opening for the passage of a locking screw 18,adapted to engage with the upper surface of the portion 16 and lock thesame in any position to which it may be adjusted, and in some cases theblock 1G may be separate from the block 12 and adj usted by hand to anydesiried position and locked in said adjusted position by the screw 18.

Pivoted to one of the ears 17 is a lockingfinger 20, having a thinengaging edge 21, passing through a slot 22 in the block 16 and providedwith a laterally-bent finger-piece,

IOO

against the under surface of which bears a plate-spring 23, one end ofwhich is secured in position by a screw 24,l forming one of the pintlesfor connecting the saw-guide to the base portion of the device.

To the saw-guide 6 is secured a segment 25, the opposite ends of whichextend between divided ears or lugs 26, formed on the sawguide, and areconnected thereto by pins 27. The upper edge of the segment is providedwith a series of notches 28, placed at varying distances from each otherand adapted to be engaged by the edge 21 of the locking-nger 20. Thecenter of the segment is coincident with the pivot-pintles of thesaw-guide and base, as shown more clearly in Fig. 3.

In using the device the base lis held against the stock to be cut, andthe saw-guide is adjusted to any suitable angle by depressing thefinger-piece 2O against the action of the spring 23 and moving thesaw-guide until the desired angle has been reached, the nger on beingreleased engaging with the proper notch and Iirmly locking the saw-guideat the proper angle. The adjustment may be changed without loss of timeand will enable the operator to cut stock at any desired angle withoutthe usual expense of time and trouble necessitated in the adjustment ofdevices of similar class having locking-screws which must be loosenedand tightened at each adjustment.

In order not to unduly increase the number of locking notches on thesegment and so interfere with ready adjustment at the angles of cuttingmore commonly in use, the

number of notches is reduced as much as possible; but delicateadjustments may be had by the movement of' the locking-finger and itscarrier 16, as hereinbefore described.

Various modiications of the structure herein described may be madeWithin the scope of the. claims without departing from the spirit orsacricing any of the advantages of my invention.

I-Iaving thus described my invention, what I claim is- 1. In a device ofthe class specied, a base having a guiding-slot, a saw-guide pivoted tothe base, a segment having its opposite ends secured to the saw-guideand adapted to the guiding-slot, a block extending through said slot andadjustable lengthwise thereof, and a spring locking-finger carried bysaid block and adapted to engage the notches of the segment.

2.- In a device of the class specified, a base having a guiding-slot, ablock adapted to said slot and adjustable lengthwise thereof,alocking-screw for holding said block in adjusted position, aspring-pressed locking-finger pivoted to said block and having itsengaging edge passing through a slot in the same, a saw-guide pivoted tothe base, and a segment secured to said saw-guide and adapted to theguiding-slot of the base, said segment having in its upper surfacenotches for the engagement of the finger.

3. In a device of the class specitied,the combination of the base, aslotted block lO thereon,a block adapted to said slot and adjustablelengthwise therein, depending ears forming part of said adjustableblock, adjustingscrews l-L in said ears and having their inner endsbearing against the block l0, a lockinginger pivoted to the block, aspring normally tending to depress Said iinger, a saw-guide pivoted tothe base, a segment carried by said saw-guide and adapted to saidguiding-slot, said segment having in its upper face a series of notchesforthe engagement of the lockingfinger.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

JAMES M. KELLY.

